On the low side of town, where the land flattens out toward the Passaic River, the grass comes in thick and fast once June settles in. K Macken Landscaping keeps pace with it, mowing on a rhythm that never lets a lawn get ahead of itself, trimming the fence lines, edging the walks. There is a particular pleasure in a yard finished at midday — the mower shut off, the drive blown clean, the smell of cut grass sitting in still air. West Caldwell's blocks run close together, and one lawn cut well quietly lifts the whole street. That is reason enough to get the height right and the lines straight, week after week.